Drill pipe is attached to the far side of the reamer so that it can be pulled back from the near side, once the pre-reaming operation is complete.
扩孔器远侧与钻杆相连，当预扩孔作业完成后，可以将扩孔器从近侧拖回到远侧。
After coke oven hole reaming at Nangang coal gas cleaning system technology of old coke oven is improved, the result shows that the system operation is stabilized.
对南钢焦炉扩孔后原焦炉煤气净化系统工艺进行了改进，系统平稳运行，取得了良好效果。
After coke oven hole reaming at Nangang coal gas cleaning system technology of old coke oven is improved, the result shows that the system operation is stabilized.
对南钢焦炉扩孔后原焦炉煤气净化系统工艺进行了改进，系统平稳运行，取得了良好效果。
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